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水稻土田间渍水条件下的水溶态亚铁量决定于土壤类型,其浓度范围为14—360ppm。庄水溶态亚铁中,络合态者一般占10—30%,其中带正电荷者较带负电荷者为多。土壤溶液中的络合态亚铁都可以由于联二呲啶的加入而释放出来。土壤加有机质渍水后,开始时离子态亚铁量迅速增加,以后渐趋平衡,但络合态铁量则经一最高值后又降低。在开始的两天内,络合态铁占水溶态亚铁总量的30—90%。络合态亚铁的表观平均稳定常数变动于2.4—4.0,在绿肥分解中期的数值最大。氢离子强烈地与亚铁争夺络合剂的配位体。在pH与络合态和离子态亚铁量的对数值之间,分别具有正和负的直线相关。锰离子在一定程度上也与亚铁争夺配位体。
The amount of water-soluble ferrous iron in paddy soils under field waterlogging conditions is determined by the type of soil and its concentration ranges from 14 to 360 ppm. In Zhuangshui dissolved ferrous iron, the complex state usually accounts for 10-30% of them, among which there are more positive charges than negative ones. The complexed ferrous iron in soil solution can be released by the addition of bispyridium. Soil with organic matter waterlogging, the beginning of the ionic state of ferrous rapidly increased, after the more balanced, but the state of the complex state of iron after a maximum and then decreased. In the first two days, the complexation of iron accounted for 30-90% of the total amount of water-soluble ferrous. The apparent average steady-state constant of ferrous complex changed from 2.4 to 4.0, which was the highest in the mid-term of green manure decomposition. Hydrogen ions strongly compete with ferrous ligands for complexing ligands. There is a positive and a negative linear correlation between pH and the logarithm of complexion and ionic ferrous amounts, respectively. Manganese ions to a certain extent also compete with the ferrous ligands.